:root {
  --seo-bg: #ffffff;
  --seo-ink: #182236;
  --seo-muted: #4b5a73;
  --seo-line: #d7dfeb;
  --seo-soft: #f6f8fc;
  --seo-accent: #2f5cff;
  --seo-accent-soft: #edf2ff;
  --seo-accent-strong: #172554;
  --seo-success: #0f766e;
  --seo-warn: #92400e;
  --seo-warn-bg: #fff7ed;
  --seo-info-bg: #eef6ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.seo-guide-body {
  margin: 0;
  color: var(--seo-ink);
  background: var(--seo-bg);
}

body.theme-aws {
  --seo-accent: #ff9900;
  --seo-accent-soft: #fff5e6;
  --seo-accent-strong: #7c3a00;
}

body.theme-azure {
  --seo-accent: #2563eb;
  --seo-accent-soft: #eff6ff;
  --seo-accent-strong: #16326a;
}

body.theme-career {
  --seo-accent: #7c3aed;
  --seo-accent-soft: #f5f3ff;
  --seo-accent-strong: #312e81;
}

body.theme-diagnostic {
  --seo-accent: #0f766e;
  --seo-accent-soft: #ecfdf5;
  --seo-accent-strong: #134e4a;
}

.seo-shell {
  width: min(100% - 32px, 1120px);
  margin: 0 auto;
}

.seo-breadcrumbs {
  padding: 18px 0 0;
  color: var(--seo-muted);
  font-size: 0.95rem;
}

.seo-breadcrumbs a {
  color: var(--seo-accent);
  text-decoration: none;
}

.seo-hero {
  background:
    radial-gradient(circle at 85% 18%, rgba(255, 255, 255, 0.18), transparent 26%),
    linear-gradient(135deg, #0f172a 0%, var(--seo-accent-strong) 48%, var(--seo-accent) 100%);
  color: #ffffff;
  padding: 58px 0 50px;
}

.seo-hero .seo-shell {
  display: grid;
  gap: 24px;
}

.seo-eyebrow {
  margin: 0;
  color: #dbeafe;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 800;
}

.seo-hero h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(2.2rem, 4.8vw, 4rem);
  line-height: 1.06;
}

.seo-lede {
  margin: 0;
  max-width: 850px;
  color: #e5ecf8;
  font-size: clamp(1.06rem, 2.2vw, 1.24rem);
  line-height: 1.7;
}

.seo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.seo-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #f8fafc;
  font-size: 0.92rem;
}

.seo-main {
  padding: 34px 0 78px;
}

.seo-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 28px;
  align-items: start;
}

.seo-article {
  min-width: 0;
}

.seo-article section {
  padding: 14px 0 18px;
}

.seo-article h2 {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 2.8vw, 2.05rem);
  line-height: 1.2;
  color: var(--seo-ink);
}

.seo-article h3 {
  margin: 18px 0 10px;
  font-size: 1.18rem;
  line-height: 1.35;
  color: var(--seo-ink);
}

.seo-article p,
.seo-article li,
.seo-article blockquote {
  color: var(--seo-muted);
  font-size: 1.03rem;
  line-height: 1.8;
}

.seo-article ul,
.seo-article ol {
  padding-left: 1.25rem;
}

.seo-article a {
  color: var(--seo-accent);
}

.seo-answer,
.seo-trust,
.seo-note,
.seo-warning,
.seo-author {
  border-radius: 16px;
  padding: 18px 20px;
}

.seo-answer {
  margin-bottom: 22px;
  border: 1px solid var(--seo-line);
  background: var(--seo-soft);
}

.seo-answer strong {
  color: var(--seo-ink);
}

.seo-trust {
  margin-bottom: 20px;
  border-left: 5px solid var(--seo-accent);
  background: var(--seo-accent-soft);
  color: var(--seo-accent-strong);
}

.seo-note {
  border-left: 5px solid #2563eb;
  background: var(--seo-info-bg);
}

.seo-warning {
  border-left: 5px solid #f59e0b;
  background: var(--seo-warn-bg);
  color: var(--seo-warn);
}

.seo-card-grid,
.seo-related-grid,
.seo-route-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.seo-card,
.seo-related-card,
.seo-route-card {
  border: 1px solid var(--seo-line);
  border-radius: 16px;
  background: #ffffff;
  padding: 18px;
}

.seo-card h3,
.seo-route-card h3 {
  margin-top: 0;
}

.seo-related-card,
.seo-route-card {
  text-decoration: none;
  color: inherit;
}

.seo-related-card:hover,
.seo-related-card:focus-visible,
.seo-route-card:hover,
.seo-route-card:focus-visible {
  border-color: var(--seo-accent);
  box-shadow: 0 14px 36px rgba(23, 34, 54, 0.08);
}

.seo-related-card strong,
.seo-route-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--seo-accent-strong);
}

.seo-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--seo-line);
  border-radius: 16px;
  background: #ffffff;
}

.seo-table-wrap table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

.seo-table-wrap th,
.seo-table-wrap td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--seo-line);
  text-align: left;
  vertical-align: top;
}

.seo-table-wrap th {
  background: var(--seo-accent-soft);
  color: var(--seo-accent-strong);
  font-size: 0.95rem;
}

.seo-table-wrap tr:last-child td {
  border-bottom: 0;
}

.seo-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.seo-kpi {
  border: 1px solid var(--seo-line);
  border-radius: 14px;
  padding: 16px;
  background: #ffffff;
}

.seo-kpi strong {
  display: block;
  margin-bottom: 6px;
  color: var(--seo-accent-strong);
}

.seo-checklist {
  columns: 2 280px;
}

.seo-faq details {
  border: 1px solid var(--seo-line);
  border-radius: 14px;
  padding: 14px 16px;
  background: #ffffff;
}

.seo-faq details + details {
  margin-top: 12px;
}

.seo-faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--seo-ink);
}

.seo-faq p {
  margin: 10px 0 0;
}

.seo-source-list li + li {
  margin-top: 10px;
}

.seo-source-list a {
  overflow-wrap: anywhere;
}

.seo-source-note {
  font-size: 0.92rem !important;
}

.seo-author {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  border: 1px solid var(--seo-line);
  background: var(--seo-soft);
}

.seo-author-badge {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--seo-accent);
  color: #ffffff;
  font-weight: 800;
}

.seo-toc {
  position: sticky;
  top: 20px;
  border: 1px solid var(--seo-line);
  border-radius: 16px;
  background: #ffffff;
  padding: 18px;
}

.seo-toc strong {
  display: block;
  margin-bottom: 12px;
  color: var(--seo-ink);
}

.seo-toc a {
  display: block;
  padding: 7px 0;
  color: var(--seo-muted);
  text-decoration: none;
}

.seo-toc a:hover,
.seo-toc a:focus-visible {
  color: var(--seo-accent);
}

.seo-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  padding: 0;
  list-style: none;
}

.seo-inline-links a {
  display: inline-flex;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--seo-accent-soft);
  color: var(--seo-accent-strong);
  text-decoration: none;
  font-weight: 700;
}

.seo-score-band {
  font-weight: 700;
  color: var(--seo-accent-strong);
}

body.dark-mode.seo-guide-body {
  --seo-bg: #0f172a;
  --seo-ink: #f8fafc;
  --seo-muted: #cbd5e1;
  --seo-line: #334155;
  --seo-soft: #1e293b;
  --seo-accent-soft: #172554;
  --seo-info-bg: #172554;
  background: var(--seo-bg);
}

body.dark-mode .seo-card,
body.dark-mode .seo-related-card,
body.dark-mode .seo-route-card,
body.dark-mode .seo-table-wrap,
body.dark-mode .seo-kpi,
body.dark-mode .seo-faq details,
body.dark-mode .seo-toc {
  background: #111827;
}

body.dark-mode .seo-warning {
  background: #422006;
  color: #fed7aa;
}

@media (max-width: 960px) {
  .seo-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .seo-toc {
    position: static;
  }
}

@media (max-width: 640px) {
  .seo-hero {
    padding: 48px 0 40px;
  }

  .seo-main {
    padding-top: 24px;
  }

  .seo-checklist {
    columns: 1;
  }
}